When is the president’s foreign policy power strongest, and when is it weakest? Why?

What will be an ideal response?

The president’s foreign policy powers tend to be strongest in times of war or emergency. Authority tends to be more centralized during these times, both practically and in terms of constitutional arrangements. This has been true of executive authority over the course of multiple wars in U.S. history. In contrast, presidential powers tend to be weaker and are subject to greater scrutiny when the United States is not in an international conflict or war or when public approval of international involvement has declined substantially.